To handle unhandled promise rejections, use try-catch blocks for async functions and attach a rejection handler to your promises. Node.js 15 and above will terminate the process on unhandled rejections, so it's crucial to catch them.

Unhandled promise rejections can lead to silent failures in your Node.js applications, making it difficult to debug issues as they arise. To effectively handle these rejections, it's essential to adopt best practices like using try-catch blocks around your asynchronous code. For example, when using async/await, wrap your async function calls in a try-catch block to catch any errors that might occur. This way, you can manage errors gracefully and provide meaningful feedback or recovery options to users. Additionally, ensure that you attach .catch() handlers to your promises to capture rejections. This practice helps prevent unhandled rejections from propagating through your application, which can result in unexpected behavior or application crashes. Starting with Node.js 15, unhandled promise rejections will cause the process to terminate by default, so it’s crucial to address this in your code. You can listen for unhandled rejections globally by adding a handler to process.on('unhandledRejection', handler) where handler is a function that manages the error appropriately, such as logging it or notifying the user. By following these practices, you can enhance the reliability and maintainability of your Node.js applications and avoid the pitfalls of unhandled promise rejections.